Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c33742d4b84bb8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 00:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29ec399dcd2860a0e2c0a8a24c5a68be SHA-1: 5460b09baaa16dc6a86cd9dc5258bd0dc5f04f28 SHA-256: 88c33742d4b84bb8ad1cea6de64b66effccf91bd7f57e32db391064127346b56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, such as 'https://irlanc.ru/uplcv?utm_term=install+flask+python', which are designed to lure users to potentially malicious content or phishing sites. The presence of numerous external links and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=install+flask+python PDF link annotation
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zapofirajagoxatamepaf.pdfIn PDF document text
    • https://pellevah.com/upload/files/89203913616.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/89155596265.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tiwoposo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xukuvidejifakele.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b27f05e5a2---50668325606.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/mofofinakowenisumuxigu.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/xepilenezoz.pdfIn PDF document text
    • http://candientuvibra.com/images/file/32657075865.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51072198521.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ti5qonu7bd42cehh9dm4hbeibl/63179679440.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/ribatujisepozix.pdfIn PDF document text
    • http://egitara.com/upfiles/files/diratowu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1cb073227b0b81446dcc392c7f985923/58070482977.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80465539936.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/57164825335.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/bafagoxinejuvunanas.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/92507107798.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/89113049788.pdfIn PDF document text
    • https://efnnma.org/files/file/pituzomuwujo.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/68819409913.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/xugexejimumepat.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/10911155780.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ff709f9b23adfb97d2ce7eaec4b0badd/bikitawogevitafuxemurop.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fawulazanifigakewevejasuj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 15012 bytes
SHA-256: cbce0375512e01ea3013a9d67cd81d5c2b8d0af7639a22b6eca7416dba273dc6
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 10288 bytes
SHA-256: 7c3a1cda5e4bc1b014cfc6057ffdd3c05701bb2334cfe3915949d5d402f24036
font_02_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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